Hoisting-gear for elevators.



No. 757,788. l 4 PATENTED APR. 19, 1904.

HOISTING GEAR FOR ELEVATORS. APPLloA'rIoN FILED JULY a1, 1903.

E0 MODEL. 2 SHEETS-SHEET 1.

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INVENTOR ww BY No. 757,788. PATENTBD APR. 19, 1904.

A. SUNDH. HOIS'I'ING GEAR `FR ELEVATORS.

APPLICIATION FILED JULY 31, 1903.

N0 MODEL. 2 SHEETS-SHEET 2.

WITNESSES I l 1M @.w2wiwwwza I UNITED STATES Patented Aprn 19, 1904. i

PATENT OEEicE.

AUGUST SUNDH, OF YONKERS, NEV YORK, ASSIGNOR TO OTIS ELEVATOR COMPANY, A CORPORATION OF NEW JERSEY.

HOlSTlNG-GEAR FOR ELEVATORS.

SPECIFICATION forming' part of Letters Patent N0. 757,788, dated April 19, 1904.

Application filed July 31, 1903.

To @ZZ whom, it may concern:

Be it known that I, AUGUST SUNDH, of Yonkers, Westchester county, New York, have invented a new and useful Improvement in Hoisting-Gear for Elevators, of which the following is a speciiication.

The invention relates to frictional hoistinggear for elevators.

The invention relates to a hoisting-gear actuated through frictional contact and means for varying said frictional contact correspondingly to and controlled by the load.

The invention consists in the construction and combinations of parts hereinafter more particularly set forth.

In the accompanying drawings, Figure 1 is i a general view show ing the c ar, counterweight, and hoisting-gear, the latter being in section on the line a: of Fig. 2. Fig. 2 is a similar view in side elevation showing also the actuating electric motor. Fig. 3 shows the hoisting-gear in cross-section on the line g/ y of Fig. 1. Fig. 4 is a front elevation, and Fig. 5 a top view, of the hoisting-gear, drawn on a larger scale than appears in the preceding figures.

Similar letters and numbers of reference indicate like parts.

Referring first to Figs. 1 and 2, A is the car, and B the counterweight connected thereto by the cable O, passing over the ixed pulleys D E. An electric motor F is supported on suitable standards G on the bed-plate H. The armature-shaft of said motor carries a pulley I, by which the friction hoisting-gear now to be describedis actuated.. On the bedplate H is a lug 1, throughwhich passes the pivot-shaft 2. Said shaft carries two pairs of arms 3 4. and 5 6. Journaled in the upper ends of arms 3 4. is the shaft7 of drum 8, and journaled in the upper ends of arms 5 6 is the shaft 9 of drum 10. The pairs of arms swing on a common pivot-shaft 2. The extent of their outward movement may be limited by the adjustable screw-stops 11 12, which enter the bed-plate and against which said arms may bear. Each drum 8 and 10 has at each end a smooth circular periphery 13 and between said smooth portions a circumferentially-grooved Serial No. 167,747. (No model.)

portion. The motor-pulley I is elongated and also has at each end a smooth circular periphery 14 and between said smooth portions a depressed portion 15. The pulley I lies between the drums 8 and 10 and above the drum-centers with its smooth peripheri'cal portions 14 in frictional contact with the smooth peripherical portions 13 of both of said drums 8 and 10. On each arm 3 il. and 5 6 are two lugs 16, carrying rollers 17 and 17, which extend between the pairs of arms and serve as guides for the cable on the drums, as hereinafter described. Finally, on the outer sides of said arms 3 11 5 6 are lugs` 18, and through the lugs on the opposite arms of the respective pairs pass loose bolts 19. A helical spring 2O extends between the head of each bolt and one lug 18, which lug thus forms an abutment for said spring. lThe other end of the bolt after passing through the opposite lug 18 is threaded to receive adjusting-nuts 21. By means of said nuts and spring the pairs of arms may be drawn together, so that the drums 8 and 10 may thus be caused to exert a predetermined initial pressure on the periphery of driving-pulley I.

|The cable O after being connected to the car A is carried over iixed pulleys D and then around the grooves in drums 8 and 1() tofill said grooves, passing between the rollers 17 and 17 andv then over fixed pulley E to the counterweight B. It will be obvious that the strain on the cable due to the weight of car and counterpoise operates to close the drums 8 and 10 together, or, in other words, to press them into frictional contact with pulley I. The motor being `set in rotation, motion is communicated from pulley I to said drums and the elevator-car raised or lowered in accordance with the direction of said rotation. It will further be noted that any increase in the load in the car will be exerted in like Inan- Yner to force the drums together and so to augment their pressure upon said pulley I,while any decrease of the loadA will permit them to move asunder, thus diminishing said pressure. The result, therefore, is that by means of this device the frictional engagement of the motor with the load depends directly upon the magniof load may be.

tude of said load, becoming greater as the load increases, but at all times automatically adjusting itself to whatever the actual condition The motor is geared to the drums without intermediate mechanism and is supported on the same bed-plate as the hoisting-gear.

I claim- 1. In a hoisting-gear, a rotary pulley, two hoisting-drums in frictional contact therewith, swinging supports for said drums and a cable adapted to be connected to the load and extending around said drums.

2. In a hoisting-gear, a rotary pulley, two hoisting-drums in frictional contact therewith, supports for said drums swinging on a common axis and a cable adapted to be connected to the load and extending around said drums.

3. In a hoisting-gear, a rotary pulley, two hoisting-d rums in frictional Contact therewith, supports for said drums swinging on a common axis located below said drums and a cable adapted to be connected to the load and extending around said drums.

4. In a hoisting-gear, a rotary pulley, two hoisting-drums in frictional contact therewith,

' swinging supports for said drums, means for regulating the extent of movement of said supports from said pulley and a cable adapted to be connected to the load and extending around said drums.

5. In a hoisting-gear, a rotary pulley, two

hoisting-drums in frictional contact therewith, swinging supports for said drums, means acting upon said supports to regulate said frictional contact and a cable adapted to be connected to the load and extending around said drums.'

6. In a hoisting-gear, two hoisting-drums, a cable adapted to be connected to the load and extending around both, a toggle-support for said drums and a rotary pulley interposed between and in frictional contact with said drums.

7. In a hoisting-gear, a rotary pulley, two movably supported hoisting drums having their axes below the axis of said pulley, means for raising said drums into friotional contact with said pulley and a cable adapted to be connected to the load and extending around said drums.

' 8. In a hoisting-gear, a rotary pulley, two hoisting drums having their axes below the axis of said pulley, means for swinging said drums upward and into frictional contact with said pulley and a cable adapted to be connected to the load and extending around said drums.

In testimony whereof I have signed my name to this specication in the presence of two subscribing witnesses.

AUGUST SUNDH. Witnesses:

I. A. VAN WART, WM. H. SIEGMAN. 

